XML 50 R38.htm IDEA: XBRL DOCUMENT v3.22.4
Note 1 - Summary of Significant Accounting Policies (Details Textual)
12 Months Ended
Nov. 30, 2022
USD ($)
Nov. 30, 2021
USD ($)
Nov. 30, 2020
USD ($)
Accounts Receivable, Threshold Period On International Sales (Day) 180 days    
Overdue Trade Receivables Interest Rate Percent of Account Balances Per Month 1.50%    
Lease, Cost, Total $ 20,121 $ 22,445  
Operating Lease, Weighted Average Remaining Lease Term 39 months    
Operating Lease, Weighted Average Discount Rate, Percent 5.50%    
Lessee, Finance Lease, Term of Contract 50 months    
Lessee, Finance Lease, Discount Rate 4.18%    
Finance Lease, Right-of-Use Asset, Amortization $ 124,256    
Contract with Customer, Liability, Revenue Recognized 559,000 474,000  
Construction Contractor, Receivable, Excluding Contract Retainage, Total 2,722,000 2,663,000 $ 2,391,000
Contract with Customer, Asset, after Allowance for Credit Loss, Total 451,000 177,000 56,000
Contract with Customer, Liability, Total $ 1,157,000 559,000 $ 474,000
Number of Operating Segments 3    
Research and Development Expense, Total $ 193,000 152,000  
Advertising Expense 190,000 163,000  
Product [Member]      
Contract with Customer, Liability, Revenue Recognized $ 1,010,000 $ 0  
Minimum [Member]      
Property, Plant and Equipment, Useful Life 3 years    
Maximum [Member]      
Property, Plant and Equipment, Useful Life 40 years    
Customer Concentration Risk [Member] | Revenue Benchmark [Member]      
Number Of Major Customers 1 1  
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | One Customer [Member]      
Concentration Risk, Percentage 11.00% 8.00%